34" x 36" or 36" x 34" Cube Core Eggcrate Return Air Grille w26h26 + Product Details Size –

+ Product Details Size – 18"w X 32"h is the size for the duct opening measurement only

Designed for optimum performance

Actual Filter Size – 24 3/4"w x 5 3/4" x 1"

+ Product Details Size - 16"w X 22"h is the size for the duct opening measurement only

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

34" x 36" or 36" x 34" Cube Core Eggcrate Return Air Grille w26h26 + Product Details Size –+ Product Details Size 34" x 36" or 36" x 34" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 35. 75" X 37. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing